Helianthin

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Helianthin \He`li*an"thin\, n. [Prob. fr. L. helianthes, or NL.
     helianthus, sunflower, in allusion to its color.] (Chem.)
     An artificial, orange dyestuff, analogous to tropaolin, and
     like it used as an indicator in alkalimetry; -- called also
     {methyl orange}.
     [1913 Webster]